Ireland laboured to an error-strewn 22-10 victory over the United States in their Rugby World Cup opener at New Zealand New Plymouth\'s Stadium Taranaki on Sunday. Despite enjoying total dominance up front throughout the Pool C clash, handling errors, slips on the wet field, misplaced passes and poor execution meant Ireland missed out on a four-try bonus point. Winger Tommy Bowe scored two tries with hooker Rory Best adding another but Irish first five eight Jonathan Sexton managed just two from six kicks at goal. Results Ireland: Tries: Tommy Bowe (2), Rory Best. Penalty: Jonathan Sexton. Conversions: Sexton, Ronan O\'Gara. USA: Try: Paul Emerick. Penalty: James Paterson. Conversion: Nese Malifa. Referee: Craig Joubert (South Africa).